1. R’ Nosson Sherman, founder of Artscroll, has a daughter married to R’ David Sutton, a Sephardi. They also published his book, Aleppo: City of Scholars. This makes me think that he’s not so biased against Sephardim.
2. Not considering how big a percentage the Sephardic Jews comprise of nowadays, it would still make a lot of sense for artscroll to bring to light Gedolim from all sects. No one mentioned that Gerrer chassidim make up X% of world Jewry, while Satmars make up Y% and Yekkes make up Z%. The reason is because a Gadol of any sect of Judiasm can inspire any other sect. Imagine if we could have a nice biography on the famous Chida, the Ben Ish Chai, Kaf Hachayim, Pri Chadash, Sdei Chemed, R’ Chaim Palacci (maybe he’s only useful for Kupat Ha’ir segulas), or R’ Ezra Attiah, the teacher to almost all recent Sephardic gedolim.
3. Sushee incorrectly pointed out that there have been many more Ashkenazic gedolim in the last 250 years, and that this is reflected in the quantity of seforim published by and about them. Sushee never did his research properly. Sephardic Gedolim have churned out more seforim than possibly imaginable. The Chida, R’ Chaim Palacci, the Ben Ish Chai each wrote about 70-80 seforim. R’ Ovadia Yosef published about 50 seforim so far. This is definitely not a thorough list of all the seforim printed by Sephardim, though one must only take a peek at any tshuva from R’ Yosef to see the dozens of seforim that he quotes from Sephardic Achronim. Also one can find an inexhaustible amount seforim devoted to kabbalah, not necessarily making the NY Times best seller list.